Processing method of integral closed double-suction impeller of main feed water pump

Abstract

The invention discloses a processing method of an integral closed double suction impeller of a main feed water pump. When used under a six axis and five linkage machining center, the processing method of the integral closed double suction impeller of the main feed water pump includes following steps: 1) matching coordinate systems of the impeller to be processed and a tooling fixture under the six axis and five linkage machining center with a coordinate system of a three dimension data model; 2) building a three dimension entity model of the impeller; 3) building a three dimension entity model of the tooling fixture, and assembling the three dimension entity model of the tooling fixture with the three dimension entity model of the impeller built in the step 2); 4) using a numeric control simulation system to simulate a machine tool control instruction generated by a tool path; 5) sending the machine tool control instruction generated in the step 4) to the six axis and five linkage machining center, and completing processing of the impeller through a machine tool. By using the processing method of the integral closed double suction impeller of the main feed water pump, processing time is shortened, tool life is prolonged, surface quality is improved, various accuracy requirements of the impeller are guaranteed, and simultaneously production efficiency needed by volume production is met, and furthermore an advanced processing level of impellers of the same structure as the integral closed double suction impeller is achieved.

Description

technical field [0001] The invention relates to a processing method for an impeller, in particular to a processing method for an integral closed double-suction impeller of a main feed water pump. Background technique [0002] Most of the impellers produced in the past have a separate structure of blades and impeller seats, which are processed separately and then assembled. The overall impeller processing is also open impeller or closed single-suction impeller. There is no double-suction closed impeller integral processing at home and abroad. [0003] In the past, the overall impeller was casted and ground by hand, but casting defects were unavoidable, and manual grinding could not guarantee the accuracy of the surface. The consistency of each flow channel cannot be guaranteed at all, which will lead to fluctuations in flow and vibration. [0004] The Chinese invention patent with the patent application number of 200610125473.X discloses a plunge milling cutter processing me...

AI Technical Summary

Problems solved by technology

[0003] In the past, the overall impeller was casted and ground by hand, but casting defects were unavoidable, and manual grinding could not guarantee the accuracy of the surface

The consistency of each flow channel cannot be guaranteed at all, which will lead to fluctuations in flow and vibration

[0004] The Chinese invention patent with the patent application number of 200610125473.X discloses a plunge milling cutter processing method for integral impeller blades. This method adopts a plunge milling cutter and simultaneously selects a feed direction that is substantially perpendicular to the arc of the top surface of the blade for processing. The feature is that the feed direction is the axial direction of the tool, and the tool and the workpiece are not easy to interfere. At the same time, the tool path is short, and the arc surface of the blade cannot be processed well.

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